Abstract: The title compounds, tris­(1,10-phenanthroline-2N,N')iron(II) bis­(2,4,5-tricarb­oxy­benzoate) monohydrate, [Fe(C12H8N2)3](C10H5O8)2·H2O, (I), and tris­(2,2'-bipyridine-2N,N')iron(II) 2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ate-benzene-1,2,4,5-tetra­carb­oxy­lic acid-water (1/1/2), [Fe(C10H8N2)3](C10H4O8)·C10H6O8·2H2O, (II), were obtained during an attempt to synthesize a mixed-ligand complex of FeII with an N-con­taining ligand and benzene-1,2,4,5-tetra­carb­oxy­lic acid via a solvothermal reaction. In both mononuclear complexes, each FeII metal ion is six-coordinated in a distorted octa­hedral manner by six N atoms from three chelating 1,10-phenanthroline or 2,2'-bipyridine ligands. In compound (I), the FeII atom lies on a twofold axis in the space group C2/c, whereas (II) crystallizes in the space group P21/n. In both compounds, the uncoordinated carboxyl­ate anions and water mol­ecules are linked by typical O-HO hydrogen bonds, generating extensive three-dimensional hydrogen-bond networks which surround the cations.

Formula:[Fe(C12H8N2)3](C10H5O8)2·H2O and [Fe(C10H8N2)3](C10H4O8)·C10H6O8·2H2O

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